Forms Data Format (FDF) is a format for handling forms within PDF documents. An FDF document is the same as a PDF document except for the presence of additional "container" areas. An FDF document can then be populated, either offline or online, to create pixel-perfect "forms". In addition, form data can be posted via HTTP as with a normal form. A system at the other end would extract the client-supplied data, and use it as needed. FDF has some advantages over normal HTML and paper forms as some legal forms require pixel-perfect entry or it can be downloaded, filled out by one party then passed on to other parties for completion. The FDF library is available from http://partners.adobe.com/asn/developer/acrosdk/forms.html. It is recommended you familiarise yourself with the FDF library documentation before using this module.